The Ball End Mill from Ball is a high-speed steel end mill with a ball nose end. It has a 1/4" shank diameter, 1/2" overall length, and a 1/4" cutting diameter. The end mill has 2 flutes and a right-hand spiral. It is designed for general purpose milling in materials like aluminum, brass, bronze, and plastics. The end mill can be run at speeds up to 5,000 RPM with light cuts and is made in the USA by Ball.